James Cook serves as the Buffalo Bills' clear lead back in 2026, handling 67% of team carries through seven games while posting 707 rushing yards at 5.1 yards per attempt and seven touchdowns. His efficiency ranks among the top qualifiers leaguewide, supported by strong yards after contact and a consistent role in the offense led by Josh Allen. Ball-security issues have drawn attention, with four fumbles in recent weeks prompting coach Joe Brady to signal potential carry reductions if the trend continues. Cook cleared a brief concussion evaluation after Week 8 and carries no injury designation heading into a challenging Week 9 road matchup against Minnesota. The remaining schedule, usage patterns, and any workload adjustments will shape his season-long rushing total.